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43 lines
803 B
C++
43 lines
803 B
C++
/*
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AM Demodulation
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Copyright 2019 Ahmet Inan <inan@aicodix.de>
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*/
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#pragma once
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namespace DSP {
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template <typename TYPE>
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class AMD1
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{
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typedef TYPE complex_type;
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typedef typename complex_type::value_type value_type;
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value_type avg, att, dec, lo, hi, idx;
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public:
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AMD1() : avg(0), att(0), dec(0), lo(0.001), hi(1), idx(1)
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{
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}
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void index(value_type modidx)
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{
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idx = modidx;
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}
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void agc(value_type attack, value_type decay, value_type low = value_type(0.001), value_type high = value_type(1))
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{
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att = attack;
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dec = decay;
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lo = low;
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hi = high;
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}
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value_type operator()(complex_type input)
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{
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value_type amp = abs(input);
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avg = lerp(avg, amp, amp < avg ? dec : att);
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avg = min(max(avg, lo), hi);
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amp /= avg;
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return (amp * (value_type(1)+idx) - value_type(1)) / idx;
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}
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};
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}
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